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3 cijfers X 3 cijfers met hulp [3]

3 cijfers X 3 cijfers met hulp [3]

 
8 8 1
9 8 8 ×
8 × 1 =
8
8 × 80 =
640
8 × 800 =
6400
80 × 1 =
80
80 × 80 =
6400
80 × 800 =
64000
900 × 1 =
900
900 × 80 =
72000
900 × 800 =
+ 720000
870428